feat: add Docker container management for MCP servers

McpOrchestrator interface with DockerContainerManager implementation,
instance service for lifecycle management, instance API routes,
and docker-compose with mcpd service. 127 tests passing.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/mcpd/package.json

@@ -20,10 +20,12 @@
     "@mcpctl/db": "workspace:*",
     "@mcpctl/shared": "workspace:*",
     "@prisma/client": "^6.0.0",
+    "dockerode": "^4.0.9",
     "fastify": "^5.0.0",
     "zod": "^3.24.0"
   },
   "devDependencies": {
+    "@types/dockerode": "^4.0.1",
     "@types/node": "^25.3.0"
   }
 }